Zinc, sae 903 or 925 base 2.3125 in. Id, 2.625 in. Max od, 0.4687 in. H outside, top 3.250 in. Max dia, 4.000 in. Radius of crown, /power steering/ lettered 3 times on top, 0.125 in. Letter on 1.0625 fn. Radius, 3 figures of eagle, form y on top, letters black